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vls 28th May 2006 03:57 PM

Improving Monitoring / Speaker positions

I need some tips for improving my mixing / speaker / sub position:

I use 2x Adam P22a and 1x Adam Sub12. At the moment, I experience different bass translation problems: Some frequencies are missing (dips), some are too much (reso). (Schrank = cabinet, it goes from floor to ceiling)

Thanks in advance!


Ethan Winer 28th May 2006 04:59 PM


> I need some tips for improving my mixing / speaker / sub position ... Some frequencies are missing (dips), some are too much (reso). <

Looking at your drawing I can see why. heh

First, the listening position is very close to the center of the room front to back. The ideal place to sit is where your ears are about 38 percent of the way back from the front wall - the wall you're facing.

But even the most ideal speaker and listener placement cannot overcome the peaks and nulls and ringing common to all rooms like this. To solve that you need bass traps. The more traps you have in the room corners, the flatter and tighter the low end will be. It's as simple as that. For a room that size at least four bass traps are needed, and even 12 wouldn't be too many.

You should also experiment with subwoofer placement. However, the only way to know which place is best is to measure the low frequency response to a very high accuracy. Typical third-octave analyzers are inadequate for small rooms. You need to measure to a resolution of at least 1/24th octave, or 1 Hz, whichever is smaller.


vls 28th May 2006 09:23 PM


Thanks for the Help! At the moment, my room is only treated with foam (5 cm and 10 cm) for the high's and the upper mids (and there's too much on the walls). What do you think i have to spend to get an acoustic environment in that you can work (it's only a homerecording studio, as you can see)? And what about foam? (You often hear that you can't treat below 400Hz with Foam [like Auralex Cornertraps etc] - is that true?) Or are there traps @ realtraps heh which can help?

I already recognized a better bass response when moving over the table (20 cm from the mix position in the direction of the front wall).... so at all i will move 33,3 cm forwards, i think.

Thanks :)


Ethan Winer 29th May 2006 05:26 PM


> Or are there traps @ realtraps heh which can help? <

Sure. Though you should move your listening position too. cooge


Glenn Kuras 30th May 2006 01:33 PM

As Ethan pointed out about the 38% rule for sure you want to do that. Mostly you want to get rigid fiberglass bass traps in your room. Focus on all corners of the room. At the point you can follow up with panels on the first reflections of the room (don't forget about the ceiling). The foam you have may be ok for the High end so don't go and throw it away, but you really need to get some bass trapping in that room.


matt thomas 30th May 2006 05:09 PM

try the demo of this software here (pc only)